Composition of matter for treating photographic paper



Patented Jan. 6, 11925,,

CHARLES N. WATERHOUSE, OF OKLAHOMA CITY, OKLAHOMA.

COMPOSITION OF I/IATTER FOR TREATING PHOTOGRAPHIO PAPER.

NO Drawing.

To a7Z whom it may concern:

Be it known that I, CHARLES N. VVATER- HOUSE, a citizen of the UnitedStates of America, and resident of Oklahoma City,

5 in the county of Oklahoma and State of Oklahoma, have invented certainnew and useful Improvements in Composition of Matter for TreatingPhotographic Paper, of which the following is a specification.

The object of my invention is the production of a composition to beapplied to photographic paper for preventing breaking or creasing of thefilm surface thereof after the picture is made on the photographic 15paper, rendering the same soft and pliable.

My composition consists of a mixture of glycerine, alcohol, formaldehydeand table salt.

In preparing the composition, I prefer to use the ingredients in aboutthe following proportions, viz: glycerine 8 parts; alcohol 1 part;formaldehyde 1 part; and table salt 1 part.

These ingredients, when mixed, form a liquid of such consistency as toenable it to be applied to the surface of the photographic paper to beprotected, and I have found in practice that the following method hasproven eflicient and satisfactory, and the in- -;o vention is especiallyuseful in protecting the surface of pictures known as circuit orpanorama pictures that measure from six to sixteen inches wide to tenfeet or more in length. 7

a; The first step of the process is to print, develop, fix and wash thepicture in the ordinary manner, after which the surplus water is removedfrom both sides of the print. The print is then placed face down it)upon a squilgee board and the chemical composition, which has beenthoroughly mixed, is applied with a soft sponge or lint cotton to theback of the print, impregnat- Application filed January 15, 1924.

Serial No. 686,457.

ing the surface of the print until. the image is finally discerniblethrough the back of the print. The print is then dried in the usual way,i. e., by laying it out flat, or by suspending it from a hanger, as mayhe preferred.

After the print has been treated in the manner stated, the paper andfilm surface are so soft that the picture may be folded withoutliability of cracking or injuring the film surface, the advantages ofwhich will be apparent to those skilled in the art.

It will be understood that glycerine is the fundamental content of theformula, its use resulting in softening the paper, and if used in theproportion given, it will not separate the film from the paper.

The alcohol used in the composition has three functions, viz: first, itthins the glycerine; second, it opens the pores of the paper so that theglycerine may penetrate the same; and third, it acts as a drier, leavingthe other solutions in the paper. The formaldehyde is added as ahardener, and when used in the proportions and with the otheringredients given, has a rubberizing effect on the paper which preventsits cracking in folding. The salt is used as a flattener, preventing thepaper from curling.

I claim:

1. A liquid composition adapted to soften the film surface ofphotographic prints after the picture is made, fixed and washed, for thepurpose of rendering the same pliable, comprising glycerine; alcohol;formaldehyde; and table salt, thoroughly mixed and commingled.

2. A liquid composition for use in the treatment of photographic printsconsisting of: 8 parts glycerine; 1 part alcohol; 1 part formaldehyde;and 1 part table salt.

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